Portion of a shoe sole



FIG. 1 is a perspective view of a portion of a shoe sole showing our new design;

FIG. 2 is a side view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom view.

The area within the solid and dash-dot dash lines forms the claimed design.

The broken line showing of a shoe upper and portions of a shoe sole are for the purpose of illustrating environmental structure and form no part of the claimed design. 

The ornamental design for a portion of a shoe sole, as shown and described. 